生物多样性 ›› 2020, Vol. 28 ›› Issue (2): 128-134.DOI: 10.17520/biods.2019276

• 研究报告:植物多样性 • 上一篇    下一篇

典型草原大针茅种群空间格局及对长期过度放牧的响应

王鑫厅1,*(),柴静1,姜超2,*(),邰阳3,迟延艳4,张维华1,3,刘芳1,李素英1   

  1. 1 内蒙古工业大学能源与动力工程学院, 呼和浩特 010051
    2 中国农业科学院草原研究所, 呼和浩特 010010
    3 内蒙古珊瑚环保技术有限公司, 呼和浩特 010010
    4 内蒙古新创环境科技有限公司, 呼和浩特 010062
  • 收稿日期:2019-09-04 接受日期:2019-11-11 出版日期:2020-02-20 发布日期:2020-04-02
  • 通讯作者: 王鑫厅,姜超
  • 基金资助:
    内蒙古自然科学基金(2017MS0302);中央级公益性科研院所基本科研业务费专项基金(1610332016002);内蒙古工业大学基金(ZD201403);内蒙古工业大学高层次引进人才科研启动基金

Population spatial pattern of Stipa grandis and its response to long-term overgrazing

Wang Xinting1,*(),Chai Jing1,Jiang Chao2,*(),Tai Yang3,Chi Yanyan4,Zhang Weihua1,3,Liu Fang1,Li Suying1   

  1. 1 School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051
    2 Institute of Grassland Research, Chinese Academy of Agriculture Sciences, Hohhot 010010
    3 Inner Mongolia Coral Environmental Technology Co., LTD, Hohhot 010010
    4 Inner Mongolia Sunture Environmental Technology Co., LTD, Hohhot 010062
  • Received:2019-09-04 Accepted:2019-11-11 Online:2020-02-20 Published:2020-04-02
  • Contact: Wang Xinting,Jiang Chao

摘要:

种群空间格局是生态学研究的基本问题之一。典型草原带由于过度放牧退化严重, 原生群落罕见, 探讨原生群落的种群空间格局具有重要生态学意义。大针茅(Stipa grandis)草原是典型草原区广泛分布的主要群落类型, 1979年围封的大针茅样地, 是目前保存完整的大针茅草原原生群落。本文选择大针茅草原原生群落和长期过度放牧群落, 应用O-Ring函数结合不同零假设模型分析了大针茅种群的空间格局。结果表明: 在原生群落中大针茅种群在小尺度范围内呈均匀分布, 而在长期过度放牧群落中则表现为聚集分布。这说明在大针茅草原原生群落中竞争是主要的相互作用, 而在长期过度放牧群落中正相互作用居主导, 验证了胁迫梯度假说; 同时证明长期过度放牧改变了种群空间格局。

关键词: 点格局分析, O-Ring函数, 胁迫梯度假说, 重复取样, 种群, 原生群落, 长期过度放牧

Abstract:

Spatial distribution patterns of plant populations is fundamental to ecology. Primary communities have become rare in the steppe because long-term overgrazing has led to serious degradation of the steppe ecosystems and requires further investigation. The most widely distributed grassland across the Eurasia steppe region is the Stipa grandis community. At present, there are well-preserved primary S. grandis communities in the steppe region. We chose the primary S. grandis community and long-term overgrazing community of S. grandis, and applied an O-Ring function combined with null models to analyze the spatial pattern of S. grandis. The results showed that the spatial pattern of S. grandis was overdispersed in the primary community at the small scale, while it was clustered in the long-term overgrazing community. These results indicate that competition was the main interaction in the primary community, while positive interactions dominated in the long-term overgrazing community. Therefore, these results verified the stress gradient hypothesis and proved that long-term overgrazing altered population spatial patterns.

Key words: point pattern analysis, O-Ring function, stress gradient hypothesis (SGH), replicate sampling, population, primary community, long-term overgrazing